form {
	width: 400px;
	margin: 0 auto; /* 水平居中 */
	border: 1px solid #ccc; /* 灰色边框 */
	padding: 20px; /* 内边距，避免内容贴边 */
	box-shadow: 0 0 10px rgba(0, 0, 0, 0.1); /* 浅阴影，增强立体感 */
     
}

.captcha-box {
  display: flex;
  align-items: center;
}
.captcha-input {
  width: 100px;
  height: 15px;
  font-size: 16px;
  margin-right: 8px;
}
.captcha-img {
  display: inline-block;
  background: #e6d6f7;
  color: #00f;
  font-style: italic;
  font-size: 15px;
  padding: 2px 6px;
  border-radius: 3px;
  margin-right: 8px;
  letter-spacing: 4px;
  user-select: none;
}
.captcha-refresh {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 15px;
  color: #3af;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}
.captcha-refresh:hover {
  background: #e0f7ff;
}

